These nipples are the original Top-Of-The-Line heavy duty; durable nipples...

Required to connect fitting to sprinkler head; sometimes referred to as a riser. Made of durable poly plastic; these 6'' long nipples are handy because you can cut them off to the desired length. No need to purchase many different lengths. A great value because one nipple can provide 3 or more short ones. The flexible poly can act as a shock absorber if the head is jarred; preventing breaks in many cases.